Warp stop-motion for looms.



G. HAMES.

WARP STOP MOTION FOR LOOMS.

APPLIGATION FILED MAY 1, 1912.

Patented Apr. 15, 1913.

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'Specificationof'Letters Patent.

Application filed May 1, 1912. I Serial No. 694,336.

To all whom it may concern:

Be itlrnown that I, Gnonss Harms, a citizen otthe United States, residing at Chelsea, in the-county of Suffolk and State of Messachusetts, have invented new and useful improvements in Warp Stop-Motions for "Looms, of which the following is a. specifi- 'known/ ltn one of the most' ordinary forms drop wire detectors are attached to each of the warp threads and the loom is so constructed that when one of these warps breaks or becomes loosened the drop-wire'falls upon some metal part and completes an electric circuit which in turn operates by means of an. elcctromagnet to shift the belt operating the loom and thus cause the loom to stop.

My invention relates to this general form of device but embodies several important 'i1nprovemcnts thereon.

In ad devices previous to mine the electric circuit is completed by the contact between the drop wire detector and some other metal part. in the operation of all looms agreat amount of light ilufijand lint is thrown oil, and as this settles in a downward direction a portion of it naturally falls onthe metal plate or other bbject in which the drop wires come in electric contact thus causing the ap 'paratus to fail to work or to tail to work v dependably. This defect ,is increased andv aggravated in the case of that class of looms employed in weaving elastic webbing. .In

elastic fabric the warps are usuallythreads Fail ' of rubber.

In order to out these rubber threads in proper conditionth be woven into a fabric it is necessary to cover them with a line clay and the result is that in the weaving operation, in addition to the find and lint being thrown off by the cotton weft threads, as is the case in the weaving of any fabric, the rubber threads throw off a large amount ofwhite clay, above mentioned, and also considerable rubber dust. This causes lnsulation to take place between the points of electrical contact between the drop Wire detectors and the plate on which they fall more quickly and thoroughly than in ordinary looms, in fact, this difiiculty so Patented Apr. 15,1913.

eat that in practical operation users of the ooms for weaving the elastic fabric have largely given up, the use of electric stop-motions for these loomsend are relying upon some form of mechanical stop-motion.

By my inventionl provide a loom wherein i the dropwire detectors fell upon a piyoted electric switch which is normally open'ind by their weight depress the switch and close the circuit. The point of electrical oontact is not where the drop wires fall upon the switch butis-placed in some protectedposh tion where the accumulation of flufi, lint, clay and rubber dust is very much less, so much so that danger of insulation is practically done away with,vand I have found my invention works perfectly in connect-ion with these looms.

Another object of my invention is to provide simple and cflicicnt and positive means whereby when-the electric current has been completed and has performed its function by stopping the loom, the said current is at once automat-icallybroken thus saving any further and unnecessary action of the batteries.

A third object of my invention is to provide an improved means for shifting the belt, supplying power to the loom, thus stopping the same when the electrical current is made by the switch above mentioned.

The invention consists in the cornhinationv and arrangement of parts set forth in the following specification and particularly pointed in the claim.

Referring to the drawings: side elevation of an elastic Fi ure l. is a lam m v equipped with the, electric stop m0tion of I my invention, broken away end shown partly in dotted lines, with-parts not essen-' tial to my invention omitted. ,Fig. '2 is a detail .front elevation showing the belt shitting rod and the connecting levers. Fig. 3 is a detail view'of a-portion' of my invention showing a group of drop wire detectors supported on warp threads, guide brackets for said detectors and -the electric' switch, Fig. 4: is a plan view of the electric switch.

Like numerals referto out the several views of the drawing.

like parts through- In the drawing is the frameof an 1 elastic fabric loom, 11 is the lay of the loom.

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12;is one of the warp threads "to be used in the process of manufacture of the fabric. e warp thread 12 is unwound from a spool or reel 13 and passes over the back girt 14 through the heddle 15 and lay 11. The drop wire detector 16 is hung by means of a hook 17 formed on the top thereof, over the warp thread 12 nearly contiguous with the back-girt 14. It is to be of course understood that there are many warp threads and drop'wire detectors. A bracket 18 is fastened to the lower side of the back girt 14 and extends downwardly therefrom. To this bracket is pivoted the electric switch 19- by means of a pivot 20. The electric switch 19 comprises two parts, the tread portion 21 and the electric content-portion 22 The tread portion 21 extends at right angles to the other part of the switch and is long enough to project beneath all of the detectors on the loom. This tread portion 21 is so positioned that any drop wire which becomes displaced by the breaking or loosening of the warp 12 will fall thereon. The drop wires 16 are guided by the brackets 23 which prevent them from any falling motion except a directly downward one. The tread 21 ismade of a suilicient width to insure the drop wire detectors 13 striking it upon any displacement. The contact portion 19 is situated on the opposite side of the switch from the tread portion 21 relatively tothe pivot 20 and it is located immediately under theback girt 14. This contact portion is weighted by the part 24 so that when in normal position, that is, when no drop wire is resting on the tread portion, it shall tip downwardly and thus keep the switch open. The weight at this end, however, is only slightly g'ieater and the diiference in weight is overcome if even one of the dropvwire detectors drops on the tread portion 21, and when this happens the contact portio'n22 moves upwardly and comes in contact with tlie contact plate 25 thus completing the electric circuit.

It will benoted that the point on the switch 19 where electric circuit is completed, thatis, the point where the contact portion 22 engages the contact plate 25, lies well under thevlargc back girt 14 which forms an efiective, shield to protect the contact portion 19 and contact plate 25 from the falling and settling fluff, lint, clay and rub-' ber dust thrown oil in the operation of the loom. f

An electro-magnet 26 is secured to the frame 10, and 27 is a rocker arm pivotally secured to the frame 10. Pivotal 1y, secured to the rocker arm 27' is an armature 28, 29 is a bolt slidably mounted on the rocker arm 27 and connected with the armature 28 by a connection 30, is a shipper rod adapted belt of the loom from pulley and vice versa.

to shift the driving the fast to the loose The rocker arm 27 is connected with one end of a bell crank lever 33 by a link 32 and to the other end of the lever is attached a link 34 connecting said lever 33 with another bell crank lever 35 which is in turn connected with the shipper rod 31. Attached to the lay 11 is the bunter 36, 37 is a circuit breaker fast to the frame 10 and adapted to be in contact with the bell crank lever 35 when the loom is in operation but out of contact when the loom is not in operation. Batteries 38 are provided for generating an electrical current which is adapted to pass (when the circuit is closed by the switch 19 and circuit breaker 37} through the wire 39, bracket 18, switch '19, contact plate 25, wire 40, electro-magne't 26, wire 4-1, circuit breaker 37, and from the circuit breaker 37 the current returns to the batteries 38, through the lever 35, the frame 10 and the wire 12.

The operation of a loom equipped with my invention is as follows: \Vhen the loom is in operation and the warp threads 12 are all unbroken and under tension, the drop wire detectors 16 are all held suspended and the switch 19 is open. If one or morc'of the warp threads 12 become broken or unduly loose the drop wire detectors attached to such threads will fall upon the tread 21 thus causing-the switch 19 to swing on its pivot and close the circuit The current passing to the electromagnet 26 will energize the same. The electro-ma net will then attractthc armature 28, wiich will in turn move the sliding bolt 29 upwardly. When the sliding bolt 29 is moved to its extended position the hunter 36 on the layll will strike, the said bolt during the beat of the lay. 'It will be observed that when the sliding bolt 29 is in its retracted position the lay is free to pass over the end of the rocker arm 27 without engaging the same in any way. When the hunter 3G strikes the sliding bolt 29 in its extended position it causes the rocker arm 27 to swing on its pivot and this motion in turn operates the link 32, lever 33, link 34; and [ever 35 to move the shipper bar 31 inwardly and thus shift the belt from the fast to the loose pulley, thus stopping the action of the loom. When the shipper bar 31 moves to shift the belt and stop the loom it brcaksthe contact which before existed between the circuit breaker 3'7 and the bell crank lever 35 and breaks the electric circuit. When the loom is thus automatically stopped the operative will of course proceed to repair the damaged warp threads which-caused the stop and when the same are repaired will again hang in position the drop wire detectors 16 which were displaced by the breaking of the warps. To again start the loom, the operative moves at contact plate 25:

the shipper bar 31 by hand to throw the belt from t e loose to the fast pulley. WVhen this is done the bell crank lever 35 again comes into contact with the circuit breaker 37 thus completing the electrical connection at that point. At this stage, however, the circuit is open because the switch 19 is out of contact with the contact late 25. This break is occasioned by the act that when the operative lifts the drop wire detectors 16 he removes the weight from the tread portion 21' of the switch 19 and the said switch falls-0f its own weight into an open position. a

Having thus described my invention, what I claim and desire by Letters Patent to se- An electric stop motion 'for looms having in combination a loom frame, a rocker arm pivoted thereto, an electro-magnet, means to energize said magnet u on warp fault, an

armature pivoted to sai rocker arm, a stop 'bolt slidably mounted on said rocker arm and connected with said armature, a belt shipper for said loom, means to connect said belt shipper and said rocker arm, provided with a hunter adapted to engage said sliding bolt whereby when said electro-magnet is energized said armature is moved toward said magnet and said sliding bolt is extended into a position to be engaged by said hunter on the said lay and said shipper belt is moved to sto said loom.

In testimony whereo I have hereunto set my hand in presence of two subscribing witnesses.

, GEORGE HAMES. Witnesses:

DANIEL A. Romans. SYDNEY E. TAFT.

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